package com.titaniue.java1;

import org.junit.Test;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;

/**
 * @program: JavaSenior
 * @description: 实现tcp的网络编程
 * 例子1:客户端发生一句话给服务端 ，服务端将数据显示到控制台
 * @author: renfei.huang
 * @create: 2021-10-24 10:08
 */
public class TCPTest1 {


    //客户端
    @Test
    public void client() throws IOException {
        Socket socket = null;
        OutputStream outputStream = null;
        try {
            //对方ip
            //1.创建sockt对象 ，指明服务的ip和端口号
            InetAddress inetAddress = InetAddress.getByName("127.0.0.1");
            socket = new Socket(inetAddress, 8899);
            //2.获取一个输出流 用于写入数据
            outputStream = socket.getOutputStream();
            //3.写入数据操作
            outputStream.write("你好我是客户端mm".getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //4.资源关闭
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }


    //服务端
    @Test
    public void server() throws IOException {

        ServerSocket serverSocket = null;
        Socket socket = null;
        InputStream inputStream = null;
        ByteArrayOutputStream byteArrayOutputStream = null;
        try {
            //1.创建服务器端的ServerSocket 指明自己的端口号
            serverSocket = new ServerSocket(8899);
            //接收来自客户端的socket
            //2.调用accept() 表示接收客户端的socket
            socket = serverSocket.accept();
            //3.获取输入流
            inputStream = socket.getInputStream();

            //不建议这样写 ：可能乱码
//        byte [] buffer = new byte[1024];
//        int len;
//        while((len = inputStream.read(buffer))!= -1){
//            String str = new String(buffer, 0, len);
//            System.out.println(str);
//        }

            //4.读取输入流中的数据
            byteArrayOutputStream = new ByteArrayOutputStream();
            byte [] buffer = new byte[5];
            int len;
            while ((len = inputStream.read(buffer))!= -1){
                byteArrayOutputStream.write(buffer,0,len);
            }
            System.out.println(byteArrayOutputStream.toString());
            System.out.println("收到来自于："+socket.getInetAddress().getHostAddress()+"的数据");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            //5.资源关闭
            if (byteArrayOutputStream != null) {
                try {
                    byteArrayOutputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (socket != null) {
                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (serverSocket != null) {
                try {
                    serverSocket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }


    }

}
